Which of the following statements is not incorrect ?

Options

A. Ovalbumin is a simple food reserve in egg - white
B. Blood proteins thrombin and fibrinogen are involved in blood clotting
C. Denaturation makes the proteins more active
D. Insulin maintains sugar level in the blood of a human body

Answer

To determine which of the following statements is not incorrect regarding the reagents used to test the unsaturation of alkenes, we can analyze the options provided:

1. **Concentrated H2SO4**: This reagent can be used to test for unsaturation, but it is not a specific test for alkenes. It can also react with alkanes under certain conditions.

2. **Solution of Br2 in CCl4**: This is a well-known test for unsaturation. When bromine is added to an alkene, the reddish-brown color of bromine disappears as it reacts with the double bond to form a colorless dibromo compound. This indicates the presence of unsaturation.

3. **Ammonical Cu2Cl2**: This reagent is used to test for terminal alkynes, not alkenes. It does not specifically indicate unsaturation in alkenes.

4. **AgNO3 in ammonical state**: This reagent is also primarily used to test for alkynes and does not specifically indicate unsaturation in alkenes.

Based on this analysis, the only reagent that specifically tests for unsaturation in alkenes is the solution of Br2 in CCl4.

### Step-by-Step Solution:
1. **Identify the Reagents**: List the reagents provided in the question.
- Concentrated H2SO4
- Solution of Br2 in CCl4
- Ammonical Cu2Cl2
- AgNO3 in ammonical state

2. **Analyze Each Reagent**:
- Concentrated H2SO4: Not specific for alkenes.
- Solution of Br2 in CCl4: Specific test for alkenes; color change indicates unsaturation.
- Ammonical Cu2Cl2: Tests for terminal alkynes, not alkenes.
- AgNO3 in ammonical state: Tests for alkynes, not alkenes.

3. **Determine the Correct Answer**: The reagent that specifically tests for unsaturation in alkenes is the solution of Br2 in CCl4.

4. **Conclusion**: The answer to the question is option B: Solution of Br2 in CCl4.